Enhanced activity and acid pH stability of Prussian blue-type oxygen evolution electrocatalysts processed by chemical etching
Han, Lijuan (Institut Català d'Investigació Química)
Tang, PengYi (Institut Català de Nanociència i Nanotecnologia)
Reyes-Carmona, Álvaro (Institut Català d'Investigació Química)
Rodríguez-García, Bárbara (Institut Català d'Investigació Química)
Torréns, Mabel (Institut Català d'Investigació Química)
Morante, Joan Ramon (Centre de Recerca en Energia de Catalunya)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Galán-Mascarós, José Ramón (Institut Català d'Investigació Química)

Date:	2016
Abstract:	The development of upscalable oxygen evolving electrocatalysts from earth-abundant metals able to operate in neutral or acidic environments and low overpotentials remains a fundamental challenge for the realization of artificial photosynthesis. In this study, we report a highly active phase of heterobimetallic cyanide-bridged electrocatalysts able to promote water oxidation under neutral, basic (pH < 13), and acidic conditions (pH > 1). Cobalt-iron Prussian blue-type thin films, formed by chemical etching of Co(OH)₁. ₀ (CO₃)₀. ₅·nH₂O nanocrystals, yield a dramatic enhancement of the catalytic performance toward oxygen production, when compared with previous reports for analogous materials. Electrochemical, spectroscopic, and structural studies confirm the excellent performance, stability, and corrosion resistance, even when compared with state-of-the-art metal oxide catalysts under moderate overpotentials and in a remarkably large pH range, including acid media where most cost-effective water oxidation catalysts are not useful. The origin of the superior electrocatalytic activity toward water oxidation appears to be in the optimized interfacial matching between catalyst and electrode surface obtained through this fabrication method.
Grants:	European Commission 279313 Ministerio de Economía y Competitividad CTQ2015-71287-R Ministerio de Economía y Competitividad MAT2014-59961-C2-2-R Ministerio de Economía y Competitividad SEV-2013-0295 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1638 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-797
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Acidic environment ; Artificial photosynthesis ; Catalytic performance ; Electrocatalytic activity ; Electrode surfaces ; Metal oxide catalysts ; Structural studies ; Water oxidation catalysts
Published in:	Journal of the American Chemical Society, Vol. 138, issue 49 (2016) , p. 16037-16045, ISSN 1520-5126

DOI: 10.1021/jacs.6b09778

Postprint 10 p, 5.8 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles